五车二短时间尺度日冕变率
Short Timescale Coronal Variability in Capella
摘要：
我们分析了钱德拉高分辨率相机成像仪（HRC-I）获得的205 ks活动双星五车二的成像数据，以确定五车二是否在< 50 ks的时间尺度上显示出任何变化。我们发现，一个明确的信号的可变性是存在的时间尺度< 20 ks，光变曲线显示的证据过度波动超过预期从一个纯粹的泊松过程。这种过度分散与2-7%水平的变异性一致，并表明五车二的二进制组件上的日冕是由低密度等离子体和低洼环组成的。
英文摘要：
We analyze 205 ks of imaging data of the active binary, Capella, obtained with the Chandra High Resolution Camera Imager (HRC-I) to determine whether Capella shows any variability at timescales < 50 ks. We find that a clear signal for variability is present for timescales < 20 ks, and that the light curves show evidence for excess fluctuation over that expected from a purely Poisson process. This overdispersion is consistent with variability at the 2-7% level, and suggests that the coronae on the binary components of Capella are composed of low-density plasma and low-lying loops.
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